<template>
  <div>
    <!-- 顶部面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数!" type="warning" show-icon :closable="false"></el-alert>
      <!-- 商品分类区域 -->
      <el-row class="select-cate">
        <el-col :span="24">
          <span>选择商品分类:</span>
          <el-cascader
            :options="cateList"
            :props="cateProps"
            :show-all-levels="false"
            @change="ChangeCate"
            v-model="selectCate"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab标签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTagClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加动态参数的按钮 -->
          <el-button
            type="primary"
            :disabled="isBtnDisabled"
            size="mini"
            @click="addDialogVisible = true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" stripe border>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="delTag(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
              <el-tag closable></el-tag>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="参数名称"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >修改</el-button>
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加静态属性的按钮 -->
          <el-button
            type="primary"
            :disabled="isBtnDisabled"
            size="mini"
            @click="addDialogVisible = true"
          >添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" stripe border>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="delTag(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
              <el-tag closable></el-tag>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="属性名称"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >修改</el-button>
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加动态参数/静态属性的对话框 -->
    <el-dialog
      :title="'添加'+ titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form :model="addForm" :rules="addFormrules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改动态参数/静态属性的对话框 -->
    <el-dialog
      :title="'修改'+ titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form :model="editForm" :rules="editFormrules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品分类列表
      cateList: [],
      //次联选择器双向绑定到的数组
      selectCate: [],
      //指定次联选择器的配置对象
      cateProps: {
        // expandTrigger: 'hover',
        label: "cat_name",
        value: "cat_id",
        children: "children"
      },
      //默认选中的tag标签名称
      activeName: "many",
      //存放动态参数的数据
      manyTableData: [],
      //存放静态属性的数据
      onlyTableData: [],
      //控制添加参数对话框显示与隐藏
      addDialogVisible: false,
      //添加动态参数或静态属性的表单数据对象
      addForm: {
        attr_name: ""
      },
      //添加表单的验证规则对象
      addFormrules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
          { min: 3, max: 10, message: "长度在 3 到 10 个字符", trigger: "blur" }
        ]
      },
      //控制修改参数对话框的显示与隐藏
      editDialogVisible: false,
      //修改参数的表单数据对象
      editForm: {},
      //修改表单验证规则
      editFormrules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
          { min: 3, max: 20, message: "长度在 3 到 20 个字符", trigger: "blur" }
        ]
      }
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: {
          type: 3
        }
      });
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg);
      }
      this.cateList = res.data;
      //this.$message.success(res.meta.msg);
      //console.log(this.cateList);
    },
    //级联选择框选中项变化，会触发的函数
    ChangeCate() {
      this.getParamsData();
    },
    //点击不同的tag标签会触发的函数
    handleTagClick() {
      this.getParamsData();
      // console.log(this.activeName);
    },
    //获取参数的列表数据
    async getParamsData() {
      //如果选中不是三级分类
      if (this.selectCate.length !== 3) {
        this.selectCate = [];
        this.manyTableData = []
        this.onlyTableData = []
        return;
      }
      //选中的是三级分类
      console.log(this.selectCate);
      //根据当前选中的三级分类id与选中的tag标签，向服务器发送请求获取参数数据
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg);
      }
      this.$message.success(res.meta.msg);
      console.log(res.data);
      res.data.forEach(item => {
        //如果item.attr_vals为真，那么就分隔成数组，否则就返回空数组
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        //控制文本框的显示与隐藏
        item.inputVisible = false;
        //文本框中输入的值
        item.inputValue = "";
      });
      //判断获取的是动态参数数据还是静态属性参数
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    //监听添加动态参数或静态属性对话框关闭事件
    addDialogClosed() {
      //关闭对话框便重置表单
      this.$refs.addFormRef.resetFields();
    },
    //点击确定按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (valid) {
          const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName
            }
          );
          if (res.meta.status !== 201) {
            return this.$message.error(res.meta.msg);
          }
          this.$message.success(res.meta.msg);
          this.addDialogVisible = false;
          this.getParamsData();
        } else {
          return;
        }
      });
    },
    //点击按钮 展示修改对话框
    async showEditDialog(attr_id) {
      this.editDialogVisible = true;
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName }
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg);
      }
      this.editForm = res.data;
      // console.log(this.editForm);
    },
    //监听修改参数对话框关闭事件
    editDialogClosed() {
      //重置修改表单
      this.$refs.editFormRef.resetFields();
    },
    //点击按钮 修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {
          return;
        }
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg);
        }
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    //根据id删除对应的参数项
    async removeParams(attr_id) {
      const confirm = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => {
        return err;
      });
      //用户取消删除
      // console.log(confirm);
      if (confirm !== "confirm") {
        return this.$message.info("取消删除");
      } else {
        //向服务器发送删除请求
        const { data: res } = await this.$http.delete(
          `categories/${this.cateId}/attributes/${attr_id}`
        );
        //如果返回状态码不等于200 说明删除失败
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg);
        }
        //后台成功删除 重新获取参数列表数据
        this.getParamsData();
      }
    },
    //文本框失去焦点或摁下了Enter都会触发
    async handleInputConfirm(row) {
      // console.log("ok");
      //如果文本框内输入内容为空 就清空文本框 切换为按钮
      if(row.inputValue.trim().length === 0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果没有return,则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      //此时需要发起请求，保存这次操作
      this.saveAttrvals(row)
    },
    //点击添加按钮 显示文本框
    showInput(row) {
      row.inputVisible = true;
      //让文本框自动获得焦点
      //$nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //将对attr_vals的操作，发请求到服务器，同步保存到数据库中
    async saveAttrvals(row){
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if(res.meta.status !== 200){
        return this.$message.error(res.meta.msg)
      }
      this.$message.success(res.meta.msg)
    },
    //删除tag标签可选项
    async delTag(i,row){
      //从row.attr_vals数组中删除改tag标签
      row.attr_vals.splice(i,1)
      //删除要向服务器发送请求
      this.saveAttrvals(row)
    }
  },
  computed: {
    //如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectCate.length !== 3) {
        return true;
      }
      return false;
    },
    //当前选中的三级分类的id
    cateId() {
      if (this.selectCate.length === 3) {
        return this.selectCate[2];
      }
      return null;
    },
    //根据选择tag不同显示不同文本内容
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    }
  }
};
</script>

<style lang="less" scoped>
.el-container {
  .el-alert {
    margin-bottom: 10px;
  }
  .el-card {
    margin-top: 20px;
  }
  .el-tag {
    margin: 10px;
  }
  .input-new-tag {
    width: 120px;
  }
}
</style>